phpMyAdmin has a filesize limit of 2MB. The limit can be increased, but we are not here to tell you how to modify your wamp.

BigDump does not like extended inserts. If your file has extended inserts and you want to use BigDump, do a database backup without extended inserts.

The best way to import the sql file is with MySQL command line. I am not familiar with Windows 7, so my directions may not be exactly correct.
Open the Command Prompt from your Windows 7 Start Menu
Now you need to change to your wamp MySQL directory. I assume your mysql version is 5.1.36
Enter at the command prompt: cd c:\{PATH_TO_WAMP_DIRECTORY}\bin\mysql\mysql5.1.36\bin
Enter at the command prompt: mysql -uUSERNAME -pPASSWORD --default_character-set=utf8 DATABASE_NAME < PATH_TO_FILE\FILENAME.EXT
The items in capital letters need to be replace with the actual values.